\documentclass{article}

\usepackage{graphicx}

\begin{document}

\includegraphics[width=0.9\textwidth]{g1}

\includegraphics[width=0.9\textwidth]{g2}

\includegraphics[width=1.1\textwidth]{g3}

\includegraphics[width=0.9\textwidth]{g4}

\end{document}
